Radiometric Measurements of Constants of Indicators. 



63 



I. 50 



II. 50 



III. 50 



IV. 50 

 V. 50 



VI. 50 



VII. 50 



VIII. 50 



c.c. methyl orange, 

 c.c methyl orange, 

 c.c. methyl orange, 

 c.c. methyl orange, 

 c.c. methyl orange, 

 c.c. methyl orange, 

 c.c. methyl orange, 

 c.c. methyl orange, 



SOLUTIONS. 



diluted to 100 c.c. 



10 c.c. sulphuric acid, diluted to 100 c.c. 

 15 c.c. sulphuric acid, diluted to 100 c.c. 

 20 c.c. sulphuric acid, diluted to 100 c.c. 

 25 c.c sulphuric acid, diluted to 100 c.c. 

 40 c.c. sulphuric acid, diluted to 100 c.c. 

 0.7 c.c. cone, sulphuric acid, diluted to 100 c.c. 

 0.8 c.c. cone, sulphuric acid, diluted to 100 c.c. 



TABLE 36. 

 [I/Io for depth of solution =20 mm. Temperature =20.] 



The values calculated from table 36 are recorded in table 37. 



TABLE 37. 



The greatest variation from the mean is less than 20 per cent. It has 

 already been shown, in one experimental case, that an error of 1 per 

 cent in the percentage transmission would cause a variation of 25 per 

 cent in the ionization constant. The determination of the percentage 

 transmissions from which the constants recorded in table 37 were cal- 



